New VLA multi-line NH3 observations of IRAS 16293-2422 reveal hot gas at 200-300 K near the protostars, attributed to shock and accretion heating.
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Blue-asymmetric spectral lines appear in 50-60% of dense cores within massive dark clumps, showing that gravitational collapse operates at core scales from prestellar stages onward and supports hierarchical star formation.
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Subarcsecond Multi-line Observations of NH$_3$ with VLA toward the Class 0 Source IRAS 16293-2422
New VLA multi-line NH3 observations of IRAS 16293-2422 reveal hot gas at 200-300 K near the protostars, attributed to shock and accretion heating.
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Global and Local Infall in the ASHES Sample (GLASHES). II. Asymmetric Line Profiles around Dense Cores in 70 $\mu$m Dark Massive Clumps
Blue-asymmetric spectral lines appear in 50-60% of dense cores within massive dark clumps, showing that gravitational collapse operates at core scales from prestellar stages onward and supports hierarchical star formation.